In addition to Don's remark. Some 0 come from fill of {. and some
come from assembling. compare with (the parenthesis is optional)
3 2 1 ({.!.9)&> 3 2 1
On Tue, 12 May 2009, Don Guinn wrote:
> The &> (every open) says to take each item of the left argument and pair it
> with each item of the right argument.So the take is done three times The
> results is then put together making a rank two array. It is like _3 _2 _1
> {."0] 3 2 1
> 0 0 3
> 0 2 0
> 1 0 0
>
>
> On Tue, May 12, 2009 at 8:17 PM, gary ng <[email protected]> wrote:
>
> > Hi,
> > I am learning J and came across the above verb but failed to reason how it
> > works.
> >
> > 3 2 1 {.&> 3 2 1
> > 3 0 0
> > 2 0 0
> > 1 0 0
> >
> > _3 _2 _1 {.&> 3 2 1
> > 0 0 3
> > 0 2 0
> > 1 0 0
> >
> > I understand the 'fill'(of those 0) but don't know why it can work on a
> > list
> > when the left operand is a list rather than an atom.
> >
> > would appreciate if someone can give me some insight.
> > ----------------------------------------------------------------------
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> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
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